<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>写到控制台</title>
	</head>
	<body>
		<script type="text/javascript">
			a = 5;
			b = 2;
			c = a + b;
			console.log(c);
		</script>
	</body>
</html>
